Shift delay and engine vibration

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First thing in morning when I start my SUV the RPM’s are about 900-1000 RPM. If I start driving immediately, the shifting is good and quick with slight engine vibration. If I wait until the engine idles down to about 625 RPM, there’s a delay (not slipping) in shifting and engine vibration. When I’m in Park and I’m listening to and feeling the idle, there’s a slight dipping sound and feeling in the idle then it returns to a smooth idle. Turning on the A/C the shift delay is longer and the engine vibration increases. Thank you, Ed Ransom